Answers: 1. Buy Poser5 upgrade electronically, from Curious website. Cheapest alternative. $145 at the moment. Big DL, total of 700MB! All you need to do is to give a valid P4 serial no. as you purchase. 2. Yes, you just enter a new serial no, no nonsense. The number gets mailed to you. And it works fine for reinstalls. 3. Yes - at least my upgrade has been great so far. Possible exception: if you are running XP, there may be issues with P5. There have been some discussions about this. I think there is a recent one in the Poser Tech Forum. :] Fish